RTT for all hostname ips

rtt.sh

#!/bin/bash

# Useful for checking rtt to any sotname of interest.
# Since servers usually have balancers or dns balancing is in place it is helpful to test every ip.

IPS=$(host $1 | grep "has address" | awk '{ print $4 }')
REQ_AMOUNT=${2:-5}

# Loop through each IP address
for IP in $IPS; do
    # Get the city information for the IP address - take the second occurrence of "City:"
    CITY=$(whois $IP | grep "City:" | head -2 | tail -1 | awk '{ print $2 }')

    # Initialize total time
    TOTAL_TIME=0

    # Repeat GET request 10 times
    for ((i=0; i<$REQ_AMOUNT; i++)); do
        # Perform GET request and measure time in seconds
        TIME=$(curl -o /dev/null -s -w '%{time_total}\n' --connect-timeout 5 http://$IP)

        echo "${TIME}ms"
        # Add time to total time
        TOTAL_TIME=$(echo "$TOTAL_TIME + $TIME" | bc)
    done

    # Calculate average time in seconds
    AVG_TIME=$(echo "scale=2; $TOTAL_TIME / $REQ_AMOUNT" | bc)

    # Convert average time to milliseconds
    AVG_TIME_MS=$(echo "$AVG_TIME * 1000" | bc)

    # Print the IP, its corresponding city, and the average response time
    echo "IP: $IP, City: $CITY, Avg Time: ${AVG_TIME_MS}ms"
done

# USAGE:
# ./rt.sh hostname.com
# ./rt.sh hostname.com req_amount

# EXAMPLE:
# ./rt.sh google.com 5